Question

Assertion (A): Ozone layer is a sort of sunscreen present high up in the atmosphere which prevents the harmful ultra-violet rays of the sun from harming us.

Reason (R): Ozone is an allotropic form of carbon which is formed in the atmosphere due to the release of chloroflurocarbons.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(3)

Explanation:

Pesticides are chemical substances used in agriculture to kill or control pests that damage crops. Therefore, the Assertion (A) is true.

DDT is an example of a pesticide that was once widely used. Pests damage crops and reduce agricultural yield. Therefore, the Reason (R) is true.

Hence, both A and R are true.